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S6806/29 LLB - Stainless-Steel, Bottom Bracket bearing - 29mm x 42mm x 7mm TH-873 BKC-0550 - BSA Thread-InS6806 29LB Stainless Steel, Bottom Bracket bearing 29mm x 42mm x 7mm This Bottom Bracket Bearing features 440C stainless steel alloy races and balls with 90% fill, high pressure, water proof grease. Not all stainless steel is created equal. Enduro only uses 440C stainless steel balls and races to provide long life and superior corrosion resistance in applications and environments that may be less than ideal. 440C has the highest strength, hardness,